The video quality of the 6D mark II is kinda soft, it is slightly worse compared to the 70D in my opinion. I need a FF 4K body with good autofocus during video, and the MarkIII is lacking that feature, so I was waiting for a long time for Canons no crop no bullshit 4K camera but unfortunately it didn't came.
I can understand why someone interested in 4k video would look elsewhere. Sony has good FF 4k, and if you're going to accept Canon's crop factors then there are a number of APS-C and m43 bodies with excellent video features and output. Of course system consistency and EF lens support, plus DPAF, could certainly lead someone to stick with Canon on video. It's here that I wish Canon would improve, either their DIGIC processors or their sensor readout speeds, whichever is the bottleneck. I would really like to see a FF 4k R body.
I cannot, however, understand the whining by stills photographers. Canon is not behind in resolution, color (they're ahead here), or high ISO. They are
slightly behind in DR. Playing with the DPReview Exposure Latitude tool the 5D IV is within 1ev of the D850 and A7 III (+5ev vs. +6ev). Heck, depending on the part of the image you're looking at the 5Dsr is within 2ev (+4ev vs +6ev) or very close at 1ev (+5ev vs +6ev). The 6D II seems to be off by a solid 2ev (+4ev vs. +6ev).
Still, that's 4ev of shadow latitude. I would like to see the HDR galleries of those complaining that the 6D II sensor is "old" or "bad". Can you actually exploit 4ev of shadow latitude? Or are you just upset that DPReview is going to lecture you again about the importance of "ISO invariance" when no one ever shoots that way since it screws up meter readings, exposure calculations (AE or manual), and EVF brightness?
The 6D II was not a bad camera in 2017 and it's not a bad camera today. Given the limited video features it is understandably a lower priced camera.
I hope that the RP has a 4k video option, though I suspect it would never be FF given the prices being discussed and the R crop. A 4k 30p 1.5x crop mode and a lower price tag would make this tempting. If Canon "protects" the R by making the RP 1080p only it will be a mistake IMHO. But it still will not make the RP a
bad camera.